<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert show-icon title="注意：只允许为三级分类设置相关参数！" type="warning" :closable="false"> </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态属性的表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model.trim="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"> </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDisabled(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性的表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model.trim="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"> </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDisabled(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数/编辑的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import $http from '../../utlis/request.js'
export default {
  name: 'params',
  data() {
    return {
      // 商品分类的列表数据
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的标签页对象
      activeName: 'many',
      // 动态表格数据
      manyTableData: [],
      // 静态表格的数据
      onlyTableData: [],
      // 控制添加参数/编辑的对话框的显示与隐藏
      addDialogVisible: false,
      // 添加数据的表单对象
      addForm: {},
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制按钮与输入框的显示与隐藏
      inputVisible: false,
      // 文本框输入的内容
      inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品列表
    async getCateList() {
      const { data: res } = await $http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      this.cateList = res.data
    },
    // 级联选择框变换，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数列表的数据
    async getParamsData() {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选中的是三级分类
      const { data: res } = await $http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')
      console.log(res.data)
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本输入框的显示与隐藏
        this.$set(item, 'inputVisible', false)
        // 文本框中输入的值
        this.$set(item, 'inputValue', '')
      })
      // 判断获取的是动态参数还是静态参数
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加编辑表单的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击确定添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await $http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')

        this.$message.success('添加参数成功!')
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 点击按钮展示修改对话框
    async showEditDisabled(attr_id) {
      // 查询当前参数的信息
      const { data: res } = await $http.get(`categories/${this.cateId}/attributes/${attr_id}`, { params: { attr_sel: this.activeName } })

      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监听修改对话框的关闭事件
    editDialogClosed() {
      // 重置表单操作
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await $http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) return this.$message.error('修改参数信息失败')
        this.$message.success('修改表单数据成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据ID删除对应的参数项
    async removeParams(attr_id) {
      const comfirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch((err) => err)

      if (comfirmResult !== 'confirm') return this.$message.info('已取消了操作')

      const { data: res } = await $http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败')
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点或按下enter键触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue)
      row.inputValue = ''
      row.inputVisible = false
      // 发起添加请求
      this.saveAttrVals(row)
    },
    // 修改的attr_vals数据保存到数据库中
    async saveAttrVals(row) {
      const { data: res } = await $http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('修改参数项失败')
      return this.$message.success('修改参数项成功')
    },
    // 点击显示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点

      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除tag标签
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮被禁用返回true 反之
    isBtnDisabled() {
      return this.selectedCateKeys.length !== 3
    },
    // 当前被选中三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]
      return null
    },
    // 动态计算标题的文本
    titleText() {
      return this.activeName === 'many' ? '动态参数' : '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
